伊斯坦布尔 yīsītǎnbù'ěr Istanbul Origin Definitions Defs Strokes Stroke Words Sentences Sents 伊 yī phonetic 斯 sī phonetic 坦 tǎn phonetic 布尔 布爾 bù'ěr phonetic Boole Boole (English surname), especially George Boole (1815–1864); (math., logic, computing) Boolean